JP5005183B2 - Connection structure between batteries - Google Patents

Connection structure between batteries Download PDF

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JP5005183B2
JP5005183B2 JP2005116373A JP2005116373A JP5005183B2 JP 5005183 B2 JP5005183 B2 JP 5005183B2 JP 2005116373 A JP2005116373 A JP 2005116373A JP 2005116373 A JP2005116373 A JP 2005116373A JP 5005183 B2 JP5005183 B2 JP 5005183B2
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battery
inter
battery connection
connection structure
cylindrical
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JP2006294524A (en
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孝博 福岡
正彦 加藤
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Panasonic Corp
Panasonic Holdings Corp
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Panasonic Corp
Matsushita Electric Industrial Co Ltd
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Priority to JP2005116373A priority Critical patent/JP5005183B2/en
Priority to US11/918,457 priority patent/US8178234B2/en
Priority to CN200680011938A priority patent/CN100590911C/en
Priority to PCT/JP2006/306857 priority patent/WO2006112251A1/en
Priority to KR1020077019397A priority patent/KR101249110B1/en
Priority to EP06730805A priority patent/EP1883126A4/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/514—Methods for interconnecting adjacent batteries or cells
    • H01M50/516—Methods for interconnecting adjacent batteries or cells by welding, soldering or brazing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/102—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure
    • H01M50/107—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/503—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the shape of the interconnectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/509—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the type of connection, e.g. mixed connections
    • H01M50/51—Connection only in series
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/514—Methods for interconnecting adjacent batteries or cells
    • H01M50/517—Methods for interconnecting adjacent batteries or cells by fixing means, e.g. screws, rivets or bolts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/521—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the material
    • H01M50/522—Inorganic material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/521—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the material
    • H01M50/526—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the material having a layered structure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M6/00—Primary cells; Manufacture thereof
    • H01M6/42—Grouping of primary cells into batteries

Description

本発明は、主として複数の円筒形電池を直列接続または並列接続して所要の出力電圧を得る電池モジュールあるいは電池パックを構成するための電池間接続構造に関するものである。   The present invention mainly relates to an inter-battery connection structure for constituting a battery module or a battery pack that obtains a required output voltage by connecting a plurality of cylindrical batteries in series or in parallel.

近年では、ＡＶ機器あるいはパソコンや携帯型通信機器などの電子機器のポータブル化やコードレス化が急速に促進されており、これらの電気機器の駆動電源として信頼性が高く、メンテナンスが容易であることから、ニッケルカドミウム蓄電池またはニッケル水素電池やリチウム二次電池などが使用されている。一方、地震や台風などの災害による停電発生時のバックアップ用非常電源などの用途には、現在、鉛蓄電池が主流であるが、将来的には大容量で、且つ大電流放電が可能なニッケル水素蓄電池の採用が期待されている。さらに、大容量を有するニッケル水素蓄電池には、無人通信基地局などの非常電源や、電車のパンタグラフ昇降用電源或いは電車の給電停止時に使用する照明点灯用バックアップ電源などの鉄道用電源用途への採用も期待されている。   In recent years, portable and cordless electronic devices such as AV devices, personal computers, and portable communication devices have been rapidly promoted, and these electronic devices are highly reliable as a driving power source and easy to maintain. Nickel cadmium storage batteries, nickel hydride batteries, lithium secondary batteries, and the like are used. On the other hand, lead-acid batteries are currently the mainstream for applications such as backup emergency power supplies in the event of a power failure due to disasters such as earthquakes and typhoons, but in the future nickel-metal hydride that has a large capacity and can discharge a large current. Adoption of storage batteries is expected. Furthermore, nickel-metal hydride storage batteries with large capacities are used for railway power supplies such as emergency power supplies for unmanned communication base stations, power supplies for raising and lowering pantographs for trains, and backup power supplies for lighting when train power is stopped. Is also expected.

上述のような電源は、複数個の円筒形電池の異極電源端子間を互いに接続して電池モジュールや電池パックに組み立てられるのが一般的である。この電池モジュールや電池パックを構成するに際して用いられる電池間接続構造は、その電池配列により、概ね２つに大別される。そのうちの一つは、図８に示すように、複数個の電池Ｂａ１，Ｂａ２を軸方向に沿った配置として、隣接する各２個の電池Ｂａ１，Ｂａ２間を互いに直列接続するものである（例えば、特許文献１参照）。この電池間接続構造は、２個の電池Ｂａ１，Ｂａ２間に配置した皿状の接続体５０を、一方の電池Ｂａ１の正極端子となる金属キャップ５１が設けられた封口板５２と、他方の電池Ｂａの負極端子となる電池ケースとにそれぞれプロジェクション溶接して接続した構成になっている。   Generally, the power source as described above is assembled into a battery module or a battery pack by connecting different power source terminals of a plurality of cylindrical batteries to each other. The inter-battery connection structure used when configuring the battery module or the battery pack is roughly divided into two according to the battery arrangement. One of them, as shown in FIG. 8, is to arrange a plurality of batteries Ba1 and Ba2 along the axial direction and connect two adjacent batteries Ba1 and Ba2 in series with each other (for example, , See Patent Document 1). In this inter-battery connection structure, a dish-like connection body 50 arranged between two batteries Ba1 and Ba2 is connected to a sealing plate 52 provided with a metal cap 51 serving as a positive electrode terminal of one battery Ba1, and the other battery. Each of the battery cases is connected to a battery case serving as a negative electrode terminal of Ba by projection welding.

すなわち、接続体５０は、電池ケース５３に外嵌する円筒部５０ａと、封口板５２に当接する平面部５０ｂとを備えているとともに、円筒部５０ａの内面と平面部５０ｂの外面とにおける同一半径上に９０°の等間隔の各位置にそれぞれプロジェクション５０ｃが形成されており、上記プロジェクション５０ｃを介してプロジェクション溶接することにより、接続体５０の平面部５０ｂを一方の電池Ｂａ１における金属キャップ５１と電気的接続された封口板５２に接続し、筒状部５０ａを他方の電池Ｂａ２の電池ケース５３に接続している。一方の電池Ｂａ１の電池ケース５３と接続体５０との間は絶縁リングによって電気的に短絡するのが防止されている。これにより、両電池Ｂａ１，Ｂａ２は、電気的に直列接続されている。   That is, the connection body 50 includes a cylindrical portion 50a that is externally fitted to the battery case 53 and a flat surface portion 50b that contacts the sealing plate 52, and has the same radius on the inner surface of the cylindrical portion 50a and the outer surface of the flat surface portion 50b. Projections 50c are respectively formed at equal intervals of 90 ° on the top, and projection welding is performed through the projection 50c, whereby the flat portion 50b of the connection body 50 is electrically connected to the metal cap 51 in one battery Ba1. The cylindrical plate 50a is connected to the battery case 53 of the other battery Ba2. The battery case 53 of one battery Ba1 and the connection body 50 are prevented from being electrically short-circuited by an insulating ring. Thereby, both batteries Ba1 and Ba2 are electrically connected in series.

他の電池間接続構造は、図９に示すように、複数個の電池Ｂａ３，Ｂａ４を径方向に並置して接続部材５９により直列接続するものである（例えば、特許文献２参照）。この電池間接続構造では、一方の電池Ｂａ３にある一端面の正極端子６０の外面と、他方の電池Ｂａ４の他端面を兼ねる電池ケース５５の露出した底部５５ａとが面一になるようにその側周面同士を密着させて隣接配置した状態で、両者の間に接続部材５９を架け渡す配置で介在させて、この接続部材５９と各電池Ｂａ３，Ｂａ４とを溶接して電気的に接続した構成になっている。すなわち、接続部材５９は、これの第１の接続部６１が電池ケース５５の底部５５ａに溶接され、且つ第２の接続部６２の環状凹部６３が封口板６４に溶接される。
特開２００３−１６２９９３号公報 特開２００２−２４６００５号公報 As shown in FIG. 9, another inter-battery connection structure is one in which a plurality of batteries Ba3 and Ba4 are juxtaposed in the radial direction and connected in series by a connection member 59 (see, for example, Patent Document 2). In this inter-battery connection structure, the outer surface of the positive electrode terminal 60 on one end surface of one battery Ba3 and the exposed bottom portion 55a of the battery case 55 that also serves as the other end surface of the other battery Ba4 are flush with each other. A configuration in which the connection members 59 and the batteries Ba3 and Ba4 are welded and electrically connected to each other with the connection members 59 interposed between them in a state where the peripheral surfaces are in close contact with each other. It has become. That is, the connection member 59 has a first connection portion 61 welded to the bottom portion 55 a of the battery case 55 and an annular recess 63 of the second connection portion 62 welded to the sealing plate 64.
JP 2003-162993 A JP 2002-246005 A

しかしながら、図８の電池間接続構造では、これを用いて電池モジュールを構成する場合、複数本の電池Ｂａ１，Ｂａ２をこれらの電池軸方向に並べて連結した細長い円柱状の外形となって、電池Ｂａ１，Ｂａ２間の曲げ強度が低いことから、特に、電池軸方向に対し側方から衝撃を受けたときの強度が不十分である。また、隣接する各２個の電池Ｂａ１，Ｂａ２の接続に際してのプロジェクション溶接時には、接続体５０のプロジェクション５０ｃを円筒形の電池ケース５３の外面に接触させた不安定な姿勢で行わなければならないために、溶接の歩留りの低下を招き、この点からも十分な強度を確保するのが困難になるとともに、溶接回数が多いのに伴って生産性が悪い。   However, in the inter-battery connection structure of FIG. 8, when a battery module is configured using this, a plurality of batteries Ba1 and Ba2 are arranged in an elongated cylindrical shape connected in the battery axial direction to form a battery Ba1. Since the bending strength between Ba2 and Ba2 is low, the strength is particularly insufficient when an impact is applied from the side in the battery axial direction. In addition, at the time of projection welding when connecting two adjacent batteries Ba1 and Ba2, the projection 50c of the connection body 50 must be performed in an unstable posture in contact with the outer surface of the cylindrical battery case 53. In this respect, the yield of welding is lowered, and it is difficult to secure sufficient strength from this point, and productivity increases as the number of weldings increases.

さらに、図８の電池間接続構造は、電池Ｂａ１，Ｂａ２を電池軸方向に沿った配置で直列接続することしかできないので、所要個数の電池を接続して電池モジュールまたは電池パックを構成する場合、一定個数の電池を直列接続した電池列を並置して、これら電池列の両端において各々の径方向で隣接する２個の電池を互いに接続するに際し、接続体５０とは別の接続部材を用いる必要がある。一方、図９の電池間接続構造は、複数個の電池をこれらの電池軸を互いに平行に配した並置状態で直列接続することしかできないので、電池を電池軸方向に配列して直列接続するに際しては例えば、図８に示されるよう接続部材を用いる必要がある。   Furthermore, since the inter-battery connection structure of FIG. 8 can only connect the batteries Ba1 and Ba2 in series in an arrangement along the battery axial direction, when a required number of batteries are connected to form a battery module or battery pack, It is necessary to use a connection member different from the connection body 50 when juxtaposing battery rows in which a certain number of batteries are connected in series and connecting two batteries adjacent in the radial direction at both ends of these battery rows. There is. On the other hand, the inter-battery connection structure of FIG. 9 can only connect a plurality of batteries in series in a juxtaposed state in which these battery axes are arranged in parallel to each other. For example, it is necessary to use a connection member as shown in FIG.

上述のように、従来の電池間接続構造では、電池軸方向への直列配置と径方向への並置した配置にそれぞれ対応した異なる形状の２種類の接続用部材を必要とするので、電池モジュールまたは電池パックを構成するに際しては、２種類の接続用部材を必要とするのに伴い、金型を含む部品費用が増大し、且つ製造コストが高くつくので、製作される電池モジュールまたは電池パックが高価なものとなる。また、何れの電池間接続構造においても、隣接する２個の電池を接続用部材の溶接により接続するので、電池モジュールのメンテナンス時において一部の電池に消耗または劣化が認められた場合、電池モジュール全体を交換しなければならず、ランニングコストが高くつく。   As described above, the conventional inter-battery connection structure requires two types of connecting members having different shapes respectively corresponding to the series arrangement in the battery axial direction and the juxtaposed arrangement in the radial direction. In constructing a battery pack, the cost of parts including a mold increases with the need for two types of connecting members, and the manufacturing cost increases, so the battery module or battery pack to be manufactured is expensive. It will be something. Also, in any inter-battery connection structure, two adjacent batteries are connected by welding of connecting members. Therefore, if some of the batteries are consumed or deteriorated during maintenance of the battery module, the battery module The whole has to be replaced, and the running cost is high.

ところで、近い将来には、１００Ａｈ程度の大容量を有して重量が１．６Ｋｇ程度のニッケル水素電池のような大型の円筒形電池の実用化が期待されているが、このような大型円筒形電池を図８または図９の電池間接続構造を用いて電池モジュールまたは電池パックを構成すると仮定した場合には、これら電池間接続構造の構成が比較的複雑であるのに伴い、溶接工程が困難となるとともに接続用部材の重量が増大し、さらに、衝撃を受けたときの強度を十分に確保することも困難であるので、実用化が極めて難しいものと予想される。   By the way, in the near future, it is expected that a large cylindrical battery such as a nickel metal hydride battery having a large capacity of about 100 Ah and a weight of about 1.6 kg will be put to practical use. When it is assumed that the battery is configured as a battery module or a battery pack using the inter-battery connection structure of FIG. 8 or FIG. 9, the welding process is difficult as the configuration of the inter-battery connection structure is relatively complicated. At the same time, the weight of the connecting member increases, and furthermore, it is difficult to ensure sufficient strength when subjected to an impact.

本発明は、上記従来の課題に鑑みてなされたもので、複数個の円筒形電池を軸方向に直列配置および径方向に並置した配置の何れに対しても同一の電池間接続板によって隣接する各２個を互いに接続できるようにしてコストの低減を図ることができ、大型円筒形電池の接続に際しても十分な堅牢性と軽量化とを有する構造を達成することができ、しかも容易に分解できる電池間接続構造を提供することを目的としている。   The present invention has been made in view of the above-described conventional problems, and a plurality of cylindrical batteries are adjacent to each other by both the series arrangement in the axial direction and the arrangement in which the cylindrical batteries are juxtaposed in the radial direction by the same inter-battery connection plate. The two can be connected to each other to reduce the cost, and a structure having sufficient robustness and light weight can be achieved even when connecting a large cylindrical battery, and can be easily disassembled. It aims at providing the connection structure between batteries.

上記目的を達成するために、請求項１に係る発明の電池間接続構造は、有底円筒状の電池ケースの底面を一方の電極端子とし、且つ前記電池ケースの開口端側に設けた封口体を他方の電極端子とした円筒形電池を複数個備え、これら円筒形電池を軸方向に直列配置または径方向に並置して、隣接する各２個の円筒形電池の異極電極端子を互いに電気的、且つ機械的に接続する電池間接続構造において、前記電池ケースの円形端面内に包含される形状の溶接部とこの溶接部から延出する接続部とを一体に有する電池間接続板を備え、前記電池ケースの一方の電極端子および他方の電極端子にそれぞれ、前記溶接部を溶接して前記電池間接続板が固着され、隣接する各２個の円筒形電池にそれぞれ固着された前記電池間接続板の各々の前記接続部が互いに重ね合わせて電気的接続状態に連結されていることを特徴としている。   In order to achieve the above object, the inter-battery connection structure of the invention according to claim 1 is a sealing body having a bottom surface of a bottomed cylindrical battery case as one electrode terminal and provided on the open end side of the battery case. A plurality of cylindrical batteries with the other electrode terminal as the other electrode terminal, these cylindrical batteries are arranged in series in the axial direction or juxtaposed in the radial direction, and the electrode terminals of two adjacent cylindrical batteries are electrically connected to each other. In the inter-battery connection structure for mechanical and mechanical connection, the inter-battery connection plate is integrally provided with a welded part having a shape included in the circular end surface of the battery case and a connecting part extending from the welded part. The inter-battery connection plate is fixed by welding the welded portion to one electrode terminal and the other electrode terminal of the battery case, and the battery is fixed to each of two adjacent cylindrical batteries. Each connecting portion of the connecting plate Is characterized in that it is coupled in electrical communication superposed each other.

請求項２に係る発明は、請求項１の発明の電池間接続構造における電池間接続板が、溶接部と接続部との境界に沿って段差部が設けられ、前記溶接部が半円弧状であって、かつ前記接続部に対し凹状に形成されている。 Invention, inter-battery connection plate in the battery between the connecting structure of the invention of claim 1, the step portion is provided along the boundary between the connecting portion welds, the weld semicircular according to claim 2 And it is formed in a concave shape with respect to the connecting portion.

請求項３に係る発明は、請求項２の発明の電池間接続構造において、電池ケースにおける開口端側のかしめ部が絶縁リングで被覆され、電池間接続板における段差部が、これの接続部側の外側面が前記絶縁リングの内側周面にほぼ合致する曲率半径を有する半円弧状を有し、且つ前記かしめ部の軸方向の端部と封口板の外面との段差よりも大きな高さを有する形状に形成されている。   According to a third aspect of the present invention, in the inter-battery connection structure according to the second aspect of the present invention, the caulked portion on the open end side of the battery case is covered with an insulating ring, and the stepped portion of the inter-battery connecting plate is connected to the connecting portion side. The outer surface has a semicircular arc shape having a radius of curvature substantially matching the inner peripheral surface of the insulating ring, and has a height greater than the step between the axial end of the caulking portion and the outer surface of the sealing plate. It is formed in the shape to have.

請求項４に係る発明は、請求項１ないし３の何れかの発明の電池間接続構造において、電池ケースの一方および他方の電極端子の何れにも同一形状の電池間接続板が固着されている。   According to a fourth aspect of the invention, in the inter-battery connection structure according to any one of the first to third aspects, an inter-battery connection plate having the same shape is fixed to one of the electrode terminals of the battery case. .

請求項５に係る発明は、請求項１ないし４の何れかの発明の電池間接続構造における各円筒形電池の両電極端子にそれぞれ接続される一対の電池間接続板が、各々の接続部の前記円筒形電池からの突出方向がなす角度を任意に設定した相対配置で接続されている。 According to a fifth aspect of the present invention, there is provided a pair of inter-battery connection plates respectively connected to both electrode terminals of each cylindrical battery in the inter-battery connection structure according to any one of the first to fourth aspects. They are connected in a relative arrangement in which the angle formed by the protruding direction from the cylindrical battery is arbitrarily set.

請求項６に係る発明は、請求項２または３の発明の電池間接続構造において、電池間接続板の接続部が、溶接部の半円弧状の径よりも大きく、且つ電池ケースの直径未満の間隔で前記溶接部から互いに平行に延出する２つの側辺と、この両側辺に直交する端辺とで囲まれた形状に形成されている。 The invention according to claim 6 is the inter-battery connection structure according to claim 2 or 3 , wherein the connection part of the inter-battery connection plate is larger than the semicircular arc-shaped diameter of the welded part and less than the diameter of the battery case. It is formed in a shape surrounded by two sides extending from the welded portion in parallel with each other at an interval and an end perpendicular to the both sides.

請求項７に係る発明は、請求項６の発明の電池間接続構造において、電池間接続板の接続部における端辺の近傍の両端側箇所に一対の連結用孔が形成されている。   According to a seventh aspect of the present invention, in the inter-battery connection structure of the sixth aspect of the present invention, a pair of connecting holes are formed at both end portions in the vicinity of the end side of the connection portion of the inter-battery connection plate.

請求項８に係る発明は、請求項７の発明の電池間接続構造において、隣接する２枚の電池間接続板が、各々の接続部がこれらの連結用孔を合致させた相対位置で互いに重ね合わされて、前記合致した連結用孔を介してボルトとナットとを螺合締結することにより電気的に接続されている。   According to an eighth aspect of the present invention, in the inter-battery connection structure of the seventh aspect, two adjacent inter-battery connection plates are overlapped with each other at a relative position in which the respective connection portions match these connecting holes. Then, the bolts and the nuts are electrically connected by screwing and fastening through the matched connecting holes.

請求項９に係る発明は、請求項８の発明の電池間接続構造において、隣接する２枚の電池間接続板における互いに重ね合わされる接続部のうちの一方に、連結用孔に合致した配置でナットが溶接により固着されている。   The invention according to claim 9 is the inter-battery connection structure of the invention according to claim 8, in which one of the connection portions of the two adjacent inter-battery connection plates that are overlapped with each other is aligned with the connecting hole. The nut is fixed by welding.

請求項１０に係る発明は、請求項８または９の発明の電池間接続構造におけるボルトとナットが黄銅製である。   According to a tenth aspect of the present invention, the bolt and nut in the inter-cell connection structure of the eighth or ninth aspect are made of brass.

請求項１１に係る発明では、請求項７ないし１０の何れかの発明の電池間接続構造にいて、電池間接続板の接続部における一対の連結用孔の間にある箇所にスリットが形成されている。   According to an eleventh aspect of the present invention, in the inter-battery connection structure according to any of the seventh to tenth aspects, a slit is formed at a location between the pair of connecting holes in the connection portion of the inter-battery connection plate. Yes.

請求項１２に係る発明は、請求項１ないし１１の何れかの発明の電池間接続構造において、電池間接続板の溶接部に、円筒形電池の電極端子に対する溶接用のプロジェクションが複数設けられ、且つ隣接する２個の前記プロジェクションの間にスリットが形成されている。   The invention according to claim 12 is the inter-battery connection structure according to any one of claims 1 to 11, wherein a plurality of projections for welding to the electrode terminals of the cylindrical battery are provided in the weld portion of the inter-cell connection plate, A slit is formed between two adjacent projections.

請求項１３に係る発明は、請求項１ないし１２の何れかの発明の電池間接続構造における電池間接続板が、鉄、銅、黄銅のいずれかの少なくとも片面にニッケルを表面加工した素材、或いはニッケル、鉄、銅を黄銅のいずれかを素材として形成されている。   According to a thirteenth aspect of the present invention, the inter-battery connection plate in the inter-battery connection structure of any one of the first to twelfth aspects is a material in which nickel is surface-treated at least on one side of any one of iron, copper, and brass, or Nickel, iron, or copper is used as a raw material.

請求項１４に係る発明は、請求項１ないし１３の何れかの発明の電池間接続構造において、隣接する２枚の電池間接続板が、互いに連結されたのちに絶縁塗料で被覆されている。   According to a fourteenth aspect of the present invention, in the inter-battery connection structure according to any one of the first to thirteenth aspects, two adjacent inter-battery connection plates are covered with an insulating paint after being connected to each other.

請求項１５に係る発明は、請求項１４の発明の電池間接続構造における絶縁塗料として遠赤塗料が用いられている。   According to the fifteenth aspect of the present invention, a far-red paint is used as the insulating paint in the inter-battery connection structure of the fourteenth aspect.

請求項１の発明では、電池間接続板の溶接部が、電池ケースの円形端面に含有される形状を有しているので、その溶接部を電池ケースにおける電池軸方向の両端面にある各電極端子の何れにも溶接することにより固着することができ、この固着状態において、電池間接続板の接続部が円筒形電池の側方に突出する。したがって、２個の円筒形電池を電池軸方向に沿って配列する場合には、これら電池に固着されている各電池間接続板の各々の接続部を互いに同一方向を向く相対配置で互いに重ね合わせて連結することにより、隣接する２個の電池を直列接続することが可能である。一方、２個の電池をその電池軸が互いに平行となる配置で配列する場合には、これら電池に固着されている各電池間接続板の接続部を互いに反対方向を向く配置で互いに重ね合わせて連結することにより、隣接する２個の電池を直列接続することが可能である。このように、複数個の円筒形電池を軸方向に直列配置および径方向に並置した配置の何れに対しても、同一の電池間接続板によって隣接する各２個を互いに接続できることから、部品費用および製造コストを共に低減できるので、電池モジュールまたは電池パックを安価に製作することができる。   In the invention of claim 1, since the welded portion of the inter-battery connection plate has a shape contained in the circular end surface of the battery case, the welded portion is provided on each electrode on both end surfaces in the battery axial direction of the battery case. It can be fixed to any of the terminals by welding, and in this fixed state, the connecting portion of the inter-battery connection plate protrudes to the side of the cylindrical battery. Therefore, when two cylindrical batteries are arranged along the battery axial direction, the connecting portions of the inter-battery connection plates fixed to the batteries are overlapped with each other in a relative arrangement in the same direction. By connecting them, it is possible to connect two adjacent batteries in series. On the other hand, when two batteries are arranged in an arrangement in which the battery axes are parallel to each other, the connecting portions of the inter-battery connection plates fixed to these batteries are overlapped with each other in an arrangement in opposite directions. By connecting, it is possible to connect two adjacent batteries in series. In this way, each of two adjacent cylindrical batteries can be connected to each other by the same inter-battery connection plate regardless of whether the cylindrical batteries are arranged in series in the axial direction or juxtaposed in the radial direction. Since both the manufacturing costs can be reduced, the battery module or the battery pack can be manufactured at low cost.

また、接続部は円筒形電池の側方において互いに重ね合わせ状態で連結するので、溶接以外の連結手段、例えばボルトとナットの締結手段などを採用することができる。そのため、大型円筒形電池を接続する場合であっても、電池間接続のための溶接工程の削減によって製作工程が容易となり、構成の簡素化に伴って、接続部分の重量の増大を招くことなしに衝撃を受けたときの強度を十分に確保できる高い堅牢性を備えた構造とすることができるとともに、メンテナンス時などに一部の電池に消耗または劣化が認められた場合に、重ね合わせ状態で連結している２枚の接続部の連結を解除することにより、必要な電池のみを交換することができる。しかも、電池間接続板は、単なる板状であるとともに、その接続部が円筒形電池の側方に突出する状態で取り付けられるから、複数個の円筒形電池を軸方向に直列配置および径方向に並置した配置の何れの形態で接続する場合であっても、互いに接続された２個の円筒形電池の間に通風可能な隙間が確保されて、十分な放熱効果を得ることができる。   Further, since the connecting portions are connected to each other in the overlapped state on the side of the cylindrical battery, connecting means other than welding, for example, fastening means for bolts and nuts can be employed. Therefore, even when a large cylindrical battery is connected, the manufacturing process is facilitated by reducing the welding process for connecting the batteries, and the weight of the connecting portion is not increased with the simplification of the configuration. It is possible to create a structure with high robustness that can ensure sufficient strength when subjected to shocks, and when the battery is worn or deteriorated during maintenance, etc. Only necessary batteries can be exchanged by releasing the connection of the two connecting portions. In addition, the inter-battery connection plate is a simple plate and is attached in a state in which the connection portion protrudes to the side of the cylindrical battery, so that a plurality of cylindrical batteries are arranged in series in the axial direction and in the radial direction. Even in the case of connecting in any form of the juxtaposed arrangement, a gap allowing ventilation can be ensured between the two cylindrical batteries connected to each other, and a sufficient heat dissipation effect can be obtained.

請求項２の発明では、電池間接続板の溶接部を、キャップ状端子が突出する側の電極端子に対し電池ケースのかしめ部と封口板の外面とが形作る凹所に嵌まり込ませた安定状態に保持して溶接できるので、常に高い接合強度で固着することができる。   According to the second aspect of the present invention, the welded portion of the inter-battery connection plate is fitted into a recess formed by the caulking portion of the battery case and the outer surface of the sealing plate with respect to the electrode terminal on the side where the cap-shaped terminal protrudes. Since it can be welded while being kept in a state, it can always be fixed with high joint strength.

請求項３の発明では、電池間接続板の段差部の外側面が絶縁リングの内側周面に嵌合状態に当接した位置決め状態で安定に保持して電池間接続板の溶接部を封口板の外面に確実に溶接できるので、常にばらつくことなく高い溶接強度が得られる堅牢性の高い接合状態を得ることができる。また、電池間接続板が電池に固着されたときには、かしめ部の軸方向の端部と接続部との間に隙間が確保されるので、放熱性が向上する利点がある。また、電池間接続板は、絶縁リングの存在により、一方および他方の電極をそれぞれ形成する電池ケースと封口板との電気的短絡を防止している。   According to the invention of claim 3, the outer surface of the step portion of the inter-battery connection plate is stably held in a positioning state in which the outer peripheral surface is in contact with the inner peripheral surface of the insulating ring, and the weld portion of the inter-battery connection plate is sealed. Since it can be reliably welded to the outer surface, it is possible to obtain a highly robust joining state that can always provide high welding strength without variation. Further, when the inter-battery connection plate is fixed to the battery, a gap is secured between the end portion in the axial direction of the caulking portion and the connection portion, so that there is an advantage that heat dissipation is improved. In addition, the inter-battery connection plate prevents an electrical short circuit between the battery case and the sealing plate that respectively form the one and the other electrodes due to the presence of the insulating ring.

請求項４の発明では、同一形状の電池間接続板のみを用いるだけで、電池軸方向に配列した２個の円筒形電池の直列接続および径方向に並置した配置の２個の円筒形電池の直列接続の双方に対応でき、電池モジュールまたは電池パックを容易、且つ安価に製作することができる。   In the invention of claim 4, only by using an inter-battery connection plate having the same shape, two cylindrical batteries arranged in series and arranged in the radial direction are connected in series in two cylindrical batteries arranged in the battery axial direction. Both series connection is possible, and the battery module or battery pack can be manufactured easily and inexpensively.

請求項５の発明では、円筒形電池の両端部にそれぞれ固着する一対の電池間接続板を、これらの接続部がなす角度を任意に設定した相対配置に調整することにより、複数個の円筒形電池を電池軸方向に配列しての直列接続および径方向に並置した配置での直列接続の何れにも容易に対応して、複数個の円筒形電池を所要の配列で接続した電池モジュールを構成することができるのに加えて、電池モジュールの製作に際しては、例えば複数の円筒形電池を俵積み配置に積み重ねた配列などの種々の配列形態に容易に対応することができる。   In the invention of claim 5, a pair of inter-battery connection plates respectively fixed to both ends of the cylindrical battery are adjusted to a relative arrangement in which the angles formed by these connection parts are arbitrarily set, thereby providing a plurality of cylindrical shapes. Constructs a battery module in which multiple cylindrical batteries are connected in the required arrangement to easily handle both series connection with batteries arranged in the battery axis direction and series connection with a parallel arrangement in the radial direction. In addition, when manufacturing the battery module, various arrangement forms such as an arrangement in which a plurality of cylindrical batteries are stacked in a stacking arrangement can be easily handled.

請求項６の発明では、円筒形電池に対して、電池間接続板の接続部が自体の長手方向にのみ突出するだけであって、幅方向に出っ張らないから、二つの接続部が互いに連結される箇所を電池ケースの直径の範囲内に設定することができ、多数個の円筒形電池を、容易、且つ安定した配置で複数段に積み重ねた電池モジュールまたは電池パックを容易に構成することができる。   In the invention of claim 6, since the connecting portion of the connecting plate between the batteries only protrudes in the longitudinal direction of the cylindrical battery and does not protrude in the width direction, the two connecting portions are connected to each other. The battery module or battery pack can be easily configured by stacking a plurality of cylindrical batteries in a plurality of stages with an easy and stable arrangement. .

請求項７の発明では、隣接する２枚の電池間接続板を、これらの連結用孔を合致させてボルトとナットの螺合締結またはリベットのかしめ手段などの手段で互いに連結することができ、隣接する各２個の円筒形電池を溶接をすることなく互いに接続することができる。また、隣接する円筒形電池の相対位置の若干のばらつきを連結用孔で吸収することができるから、円筒形電池を電池軸方向に沿った配置または径方向に並置する場合に、円筒形電池の相対位置の位置決めに自由度が生じて、位置調整が容易となる。   In the invention of claim 7, two adjacent inter-battery connection plates can be connected to each other by means such as screwed fastening of bolts and nuts or rivet caulking means with these connecting holes being matched, Two adjacent cylindrical batteries can be connected to each other without welding. In addition, since slight variations in the relative positions of adjacent cylindrical batteries can be absorbed by the connecting holes, when the cylindrical batteries are arranged along the battery axial direction or juxtaposed in the radial direction, A degree of freedom arises in the positioning of the relative position, and the position adjustment becomes easy.

請求項８の発明では、隣接する２枚の電池間接続板を、これらの連結用孔を合致させてボルトとナットの締結により連結することができるから、２個の円筒形電池を相互に接続するに際しての溶接工程を削減できるとともに、メンテナンス時などにおいて、電池モジュールまたは電池パックにおける一部の円筒形電池に消耗または劣化が認められた場合には、ボルトを外して必要な円筒形電池のみを交換することが可能となり、従来のように電池モジュールを単位として交換する場合に比較して、ランニングコストを大幅に低減できる。   In the invention of claim 8, two adjacent battery connecting plates can be connected by fastening bolts and nuts so that these connecting holes are matched, so that two cylindrical batteries are connected to each other. In the case of maintenance, etc., if some cylindrical batteries in the battery module or battery pack are worn or deteriorated, remove the bolts and replace only the necessary cylindrical batteries. It is possible to replace the battery module, and the running cost can be greatly reduced as compared with the case where the battery module is replaced as a unit as in the prior art.

請求項９の発明では、２個の円筒形電池にそれぞれ溶接された電池間接続板の各々の連結用孔を合致させたのちに、この合致させた両連結用孔にボルトを挿通してナットに螺合締結するだけで、隣接する２個の円筒形電池の接続を行えるので、接続のための作業性が格段に向上する。   According to the ninth aspect of the present invention, after fitting the connecting holes of the inter-battery connection plates respectively welded to the two cylindrical batteries, bolts are inserted into the matched connecting holes and the nuts are inserted. Since it is possible to connect two adjacent cylindrical batteries simply by screwing together, workability for connection is greatly improved.

請求項１０の発明では、ボルトとナットの電気抵抗が低くなるので、一層の高出力化を図ることができる。   In the invention of claim 10, since the electric resistance of the bolt and the nut is lowered, it is possible to further increase the output.

請求項１１の発明では、隣接する２枚の電池間接続板をボルトとナットの締結により連結する場合に、溶接部を円筒形電池に溶接したときに電池間電極板に生じる歪みを、スリットの存在により容易に変形させて吸収することができるから、確実な締結を行うことができる。一方、隣接する２枚の電池間接続板を溶接により連結する場合には、スリットが溶接時の無効電流を低減するように作用するとともに、双方の電池間接続板の歪みをスリットの存在により容易に変形させて吸収することができるから、確実な溶接を行える。   In the invention of claim 11, when two adjacent battery connection plates are connected by fastening bolts and nuts, distortion generated in the battery electrode plate when the welded portion is welded to the cylindrical battery is reduced. Since it can be easily deformed and absorbed by its presence, reliable fastening can be performed. On the other hand, when two adjacent battery connection plates are connected by welding, the slit acts to reduce the reactive current during welding, and the distortion of both battery connection plates is facilitated by the presence of the slit. Since it can be deformed and absorbed, reliable welding can be performed.

請求項１２の発明では、プロジェクションを介して電池間接続板の溶接部を電池ケースに溶接するときに、スリットによって溶接時の無効電流を低減でき、且つ溶接部と電池ケースとの双方の歪みをスリットの存在により容易に変形させて吸収することができるから、確実なプロジェクション溶接を行って高い接合強度を得ることができる。   In invention of Claim 12, when welding the welding part of the connection board between batteries to a battery case via a projection, the reactive current at the time of welding can be reduced with a slit, and distortion of both a welding part and a battery case can be reduced. Since it can be easily deformed and absorbed by the presence of the slits, high joint strength can be obtained by performing reliable projection welding.

請求項１３の発明では、電気抵抗の低い電池間接続板となるので、製作後の電池モジュールまたは電池パックの高出力化を一層促進できる。   In the thirteenth aspect of the invention, since the inter-battery connection plate has a low electric resistance, the output of the battery module or battery pack after manufacture can be further promoted.

請求項１４の発明では、電池間接続板の外表面が電気が絶縁されるから、安全性を一層高めることができる。   In the invention of claim 14, since the outer surface of the inter-battery connection plate is insulated from electricity, safety can be further enhanced.

請求項１５の発明では、電池間接続板の絶縁効果に加えて、電池間接続板に放熱効果が付加され、あたかも放熱フィンの如く機能する。   According to the fifteenth aspect of the present invention, in addition to the insulating effect of the inter-battery connection plate, a heat dissipation effect is added to the inter-battery connection plate, which functions as if it were a heat radiating fin.

以下、本発明の最良実施の形態について、図面を参照しながら詳細に説明する。図１は本発明の一実施の形態に係る電池間接続構造の接続構成を示す斜視図であり、図２はその接続に用いる電池間接続板１を示す斜視図である。先ず、図２の電池間接続板１について説明する。この電池間接続板１は、電池ケースに溶接手段で固着される溶接部２と、この溶接部２から延出した接続部３とが、段差部４を介して一体に連接された形状を有しており、溶接部２が接続部３に対し凹所になっている。   DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the best mode of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view showing a connection configuration of an inter-battery connection structure according to an embodiment of the present invention, and FIG. 2 is a perspective view showing an inter-battery connection plate 1 used for the connection. First, the inter-battery connection plate 1 of FIG. 2 will be described. The inter-battery connecting plate 1 has a shape in which a welded portion 2 fixed to a battery case by welding means and a connecting portion 3 extending from the welded portion 2 are integrally connected via a stepped portion 4. The welded part 2 is recessed with respect to the connecting part 3.

上記溶接部２は、図１に示す電池Ｂａの電池ケース７における円形の端面内に包含される半円弧状の形状を有している。具体的には、電池Ｂａの円形の電極端子板８（図１）の周端面よりも僅かに大きな曲率半径を有する半円形の内周部２ａと、電池ケース７における開口端側の円形のかしめ部の内側内周面に対応した曲率半径を有する半円形の外周部２ｂとで囲まれた半円弧状の形状を有している。この溶接部２には、抵抗溶接用のプロジェクション９が複数（この実施の形態において４個）設けられているとともに、隣接する各２個のプロジェクション９の各間にある部位にスリット１０が形成されている。   The welded portion 2 has a semicircular arc shape included in a circular end surface of the battery case 7 of the battery Ba shown in FIG. Specifically, a semicircular inner peripheral portion 2 a having a slightly larger radius of curvature than the peripheral end surface of the circular electrode terminal plate 8 (FIG. 1) of the battery Ba, and a circular crimp on the opening end side of the battery case 7. It has a semicircular arc shape surrounded by a semicircular outer peripheral portion 2b having a radius of curvature corresponding to the inner inner peripheral surface of the portion. The welded portion 2 is provided with a plurality of resistance welding projections 9 (four in this embodiment), and slits 10 are formed at portions between two adjacent projections 9. ing.

上記接続部３は、一対の側辺３ａ，３ｂとこの側辺３ａに直交する端辺３ｃとを有するほぼ矩形状に形成されており、一対の側辺３ａ，３ｂは、溶接部２の半円弧状の径よりも大きく、且つ電池ケース７の直径よりも僅かに小さい間隔で溶接部２から互いに平行に延出されている。この接続部３には、端辺３ｃの中央部から両側辺３ａ，３ｂに平行に延びるスリット１１が形成されているとともに、一対の連結用孔１２が端辺３ｃの両端部近傍部位に形成されている。なお、接続部３には、図２に示す電池間接続板１の下面側に、一対のナット１３が連結用孔１２に合致するよう位置決めして予め溶接により固着される場合もある。   The connecting portion 3 is formed in a substantially rectangular shape having a pair of side sides 3 a and 3 b and an end side 3 c orthogonal to the side side 3 a, and the pair of side sides 3 a and 3 b are half of the welded portion 2. Larger than the arcuate diameter and slightly parallel to the diameter of the battery case 7 are extended in parallel from the weld 2. The connecting portion 3 is formed with a slit 11 extending in parallel to the side sides 3a and 3b from the central portion of the end side 3c, and a pair of connecting holes 12 are formed in the vicinity of both end portions of the end side 3c. ing. In some cases, a pair of nuts 13 are positioned on the connecting portion 3 on the lower surface side of the inter-battery connecting plate 1 shown in FIG.

上記段差部４は、溶接部２の半円形の外周部２ｂから立ち上がった平面視半円弧状であって、接続部３側の外側面が、電池ケース７の開口端部のかしめ部における内側周面に合致した曲率半径の半円弧状に形成され、且つ電池Ｂａの封口板１４からかしめ部の軸方向端部までの距離よりも僅かに大きな高さとを有している。この溶接部２と接続部３とが段差部４を介して一体に連接された形状を有する電池間接続板１は、鉄、銅、黄銅等の少なくとも片面にニッケルを表面加工した素材、或いはニッケル、鉄、銅、黄銅等を素材として一体形成されて、低い電気抵抗に設定されていることにより、高出力化が図られている。   The stepped portion 4 has a semicircular arc shape in plan view rising from the semicircular outer peripheral portion 2 b of the welded portion 2, and the outer surface on the connection portion 3 side is the inner periphery of the caulked portion at the open end of the battery case 7. It is formed in a semicircular arc shape with a radius of curvature that matches the surface, and has a height that is slightly larger than the distance from the sealing plate 14 of the battery Ba to the axial end of the caulking portion. The inter-battery connection plate 1 having a shape in which the welded portion 2 and the connecting portion 3 are integrally connected via a stepped portion 4 is made of a material obtained by surface-treating nickel on at least one side such as iron, copper, brass, or nickel. , Iron, copper, brass and the like are integrally formed as a material and set to a low electric resistance, so that high output is achieved.

つぎに、上記電池間接続板１を用いた電池間接続構造について、図１を参照しながら説明する。なお、図１では、絶縁リング１８を電池ケース７の開口端側のかしめ部に被せる状態で取り付けられた状態を例示しており、これの詳細については後述する。上記電池間接続板１は、溶接部２が電池ケース７における円形の端面内に包含される半円弧状の形状を有していることから、電池Ｂａにおける正極端子である電極端子板８が接合された封口板１４および負極端子となる電池ケース７の底面１７の双方に共通に取り付けることができる。   Next, an inter-battery connection structure using the inter-battery connection plate 1 will be described with reference to FIG. In addition, in FIG. 1, the state attached in the state which covers the crimping part by the side of the opening end of the battery case 7 of the insulating ring 18 is illustrated, and the detail is mentioned later. Since the inter-battery connection plate 1 has a semicircular arc shape in which the welded portion 2 is included in the circular end surface of the battery case 7, the electrode terminal plate 8 that is the positive electrode terminal in the battery Ba is joined. The sealing plate 14 and the bottom surface 17 of the battery case 7 to be the negative terminal can be attached in common.

先ず、電池間接続板１を、電池Ｂａの封口板１４に溶接部２を溶接して取り付けるに際しては、溶接部２を電池Ｂａの封口板１４上に載置して、段差部４の外側面を絶縁リング１８の内側周面１８ａに宛がうと、段差部４の外側面が絶縁リング１８の内側周面１８ａにほぼ合致した曲率半径の半円弧状に形成されていることから、段差部４の外側面が絶縁リング１８の内側周面１８ａに対しほぼ嵌合する状態に密着して位置決めされるので、電池間接続板１を安定に保持した状態で溶接部２を封口板１４に溶接することができる。そのため、互いに溶接された溶接部２と封口板１４とには常にばらつくことなく高い溶接強度が確保され、堅牢性の高い接合状態を得ることができる。   First, when the inter-battery connection plate 1 is attached to the sealing plate 14 of the battery Ba by welding the welded portion 2, the welded portion 2 is placed on the sealing plate 14 of the battery Ba and the outer surface of the stepped portion 4 is placed. Is directed to the inner peripheral surface 18 a of the insulating ring 18, the outer surface of the stepped portion 4 is formed in a semicircular arc shape having a curvature radius substantially matching the inner peripheral surface 18 a of the insulating ring 18. Since the outer side surface of the insulating ring 18 is positioned in close contact with the inner peripheral surface 18a of the insulating ring 18, the welded portion 2 is welded to the sealing plate 14 while the inter-battery connection plate 1 is stably held. be able to. Therefore, high weld strength is ensured without always varying between the welded portion 2 and the sealing plate 14 that are welded to each other, and a highly robust joining state can be obtained.

上記溶接に際しては、溶接部２におけるプロジェクション９に対応する部位に一対の溶接電極をそれぞれ当接させて、プロジェクション溶接が行われる。それにより、溶接電流は、接触面積が小さいことから接触抵抗が大きいプロジェクション９と封口板１４との接触部分に局部的に集中して流れ、それによる発熱によってプロジェクション９が溶融して、溶接部２と封口板１４とが相互に接合される。このとき、溶接部２のスリット１０は、プロジェクション溶接時の無効電流を低減するとともに、封口板１４と溶接部２との各々の歪みを、スリット１０の存在によって容易に変形させて吸収することができるから、確実な溶接を行うことができる。   In the welding, projection welding is performed by bringing a pair of welding electrodes into contact with portions corresponding to the projection 9 in the welded portion 2. Accordingly, the welding current flows locally and concentrates on the contact portion between the projection 9 and the sealing plate 14 having a large contact resistance because the contact area is small, and the projection 9 is melted by the heat generated thereby, so that the welding portion 2 is melted. And the sealing plate 14 are joined to each other. At this time, the slit 10 of the welded portion 2 can reduce the reactive current during projection welding and can easily deform and absorb each distortion of the sealing plate 14 and the welded portion 2 due to the presence of the slit 10. Therefore, reliable welding can be performed.

一方、電池間接続板１を、電池Ｂａの電池ケース７の底面１７に溶接して取り付けるに際しては、溶接部２を電池Ｂａにおける電池ケース７の底面１７に宛がって、溶接部２におけるプロジェクション９に対応する部位に一対の溶接電極をそれぞれ当接させた状態でプロジェクション溶接が行われる。それにより、溶接電流は、接触面積が小さいことから接触抵抗が大きいプロジェクション９と底面１７との接触部分に局部的に集中して流れ、それによる発熱によってプロジェクション９が溶融して、溶接部２と底面１７とが相互に接合される。このとき、溶接部２のスリット１０は、プロジェクション溶接時の無効電流を低減するとともに、溶接部２と底面１７との各々の歪みを、スリット１０の存在によって容易に変形させて吸収できるから、確実な溶接を行うことができる。   On the other hand, when the inter-battery connection plate 1 is attached by welding to the bottom surface 17 of the battery case 7 of the battery Ba, the welded portion 2 is directed to the bottom surface 17 of the battery case 7 in the battery Ba, and the projection at the welded portion 2 is performed. Projection welding is performed in a state where a pair of welding electrodes are in contact with portions corresponding to 9 respectively. As a result, the welding current flows locally in a concentrated manner at the contact portion between the projection 9 and the bottom surface 17 having a large contact resistance because the contact area is small, and the projection 9 is melted by the heat generated thereby. The bottom surface 17 is joined to each other. At this time, the slit 10 of the welded portion 2 reduces the reactive current during projection welding and can easily deform and absorb each distortion of the welded portion 2 and the bottom surface 17 due to the presence of the slit 10. Welding can be performed.

そして、図１に示すように、２個の電池Ｂａを並置してこれらを径方向に電気的に直列接続する場合には、電池ケース７の開口端側および底面１７からそれぞれ側方に突出している２枚の電池間接続板１の各接続部３を、互いに反対方向を向く配置で重ね合わせて、各々の一対の連結用孔１２を合致させた相対配置に位置決めし、この重ね合わせ状態の各２つの連結用孔１２の一方側から挿通したボルト１９を他方側のナット１３に螺合締結することにより、上記２枚の電池間接続板１が相互に電気的接続状態で連結される。隣接する２個の円筒形電池Ｂａの相対位置の若干のばらつきは、一対の電池用接続板１の位置決め時に連結用孔１２で吸収することができるから、円筒形電池Ｂａを電池軸方向に沿った配置または径方向に並置する場合に、円筒形電池Ｂａの相対位置の位置決めに自由度が生じて、位置調整が容易となる。また、一対の電池間接続板１をボルト１９とナット１３の螺合締結により接続する時には、双方の電池間電極板１の歪みを各々のスリット１１の存在により容易に変形させて吸収できるから、確実な螺合締結を行うことができる。   As shown in FIG. 1, when two batteries Ba are juxtaposed and electrically connected in series in the radial direction, the battery case 7 protrudes laterally from the open end side and the bottom surface 17. The connection portions 3 of the two inter-battery connection plates 1 are overlapped so as to face each other in opposite directions, and positioned in a relative arrangement in which each pair of connecting holes 12 is matched. The two inter-battery connection plates 1 are connected to each other in an electrically connected state by screwing and fastening bolts 19 inserted from one side of the two connecting holes 12 to the nut 13 on the other side. A slight variation in the relative position of the two adjacent cylindrical batteries Ba can be absorbed by the connecting hole 12 when positioning the pair of battery connection plates 1, so that the cylindrical battery Ba is aligned along the battery axial direction. In the case where the cylindrical batteries Ba are juxtaposed or arranged in the radial direction, a degree of freedom is generated in positioning of the relative position of the cylindrical battery Ba, and the position adjustment becomes easy. Further, when connecting the pair of inter-battery connection plates 1 by screwing the bolts 19 and the nuts 13, the distortion of both the inter-battery electrode plates 1 can be easily deformed and absorbed by the presence of the respective slits 11. Secure screw fastening can be performed.

なお、この電池間接続構造は同一の電池間接続板１を電池ケース７の開口端側および底面１７の何れにも共通に取り付けられることが特長の一つであるが、電池ケース７の底面１７への取り付け用とした電池間接続板１の一面に連結用孔１２に合致した配置でナット１３を予め固着しておけば、上記連結作業を一層容易、且つ迅速に行うことができる。   The inter-battery connection structure is characterized in that the same inter-battery connection plate 1 can be commonly attached to both the open end side and the bottom surface 17 of the battery case 7. If the nut 13 is secured in advance to the surface of the inter-battery connection plate 1 that is used for attachment to the connection hole 12, the connection operation can be performed more easily and quickly.

上述のように２枚の電池間接続板１をボルト１９とナット１３との締結手段で連結する構成としたことにより、電池間接続構造の製作時の溶接工程を削減できるとともに、この電池間接続構造を用いて構成した電池モジュールまたは電池パックのメンテナンス時などにおいて、一部の円筒形電池Ｂａの消耗または劣化が認められた場合には、ボルト１９を外して必要な円筒形電池Ｂａのみを交換することができ、従来のように電池モジュールまたは電池パックを単位として交換する場合に比較してランニングコストを大幅に低減できる大きなメリットがある。なお、隣接する２枚の電池間接続板１を、上述のボルト１９とナット１３を螺合締結する連結手段に代えて、溶接により互いに固着して連結しても良い。この場合には、スリット１１が溶接時の無効電流を低減するよう作用するとともに、２枚の電池間接続板１の歪みをスリット１１自体の存在により容易に変形させて吸収できるから、確実な溶接を行える。   As described above, by connecting the two inter-battery connection plates 1 with the fastening means of the bolts 19 and the nuts 13, it is possible to reduce the welding process at the time of manufacturing the inter-battery connection structure, and to connect the inter-battery connections. If some of the cylindrical batteries Ba are worn or deteriorated during maintenance of a battery module or battery pack constructed using the structure, remove the bolts 19 and replace only the necessary cylindrical batteries Ba. There is a great merit that the running cost can be greatly reduced as compared with the conventional case where the battery module or the battery pack is replaced as a unit. Instead of the connecting means for screwing and fastening the bolt 19 and the nut 13 to each other, the two adjacent battery connection plates 1 may be fixedly connected to each other by welding. In this case, the slit 11 acts to reduce the reactive current during welding, and the distortion of the two inter-battery connection plates 1 can be easily deformed and absorbed by the presence of the slit 11 itself. Can be done.

図３は本発明の電池間接続構造を用いて６個の円筒形電池Ｂａを電気的に直列接続して構成した電池モジュール２０を示し、図４および図５はそれぞれ図３のＡ−Ａ線切断拡大断面図およびＢ−Ｂ線切断拡大断面図である。図４は、図１と同様に、電池モジュール２０における径方向に並置する配置で隣接する２個の円筒形電池Ｂａを互いに電気的に直列接続して構成した電池間接続構造の部分を示したものであり、図１において説明した接続過程を経て、同一の２枚の電池間接続板１の相互連結により２個の円筒形電池Ｂａの各々の異極を互いに電気的接続して構成されている。   FIG. 3 shows a battery module 20 constructed by electrically connecting six cylindrical batteries Ba in series using the inter-battery connection structure of the present invention. FIGS. 4 and 5 are respectively taken along line AA in FIG. It is a cutting expanded sectional view and a BB line cutting expanded sectional view. FIG. 4 shows a part of the inter-battery connection structure formed by electrically connecting two adjacent cylindrical batteries Ba in series in the radial arrangement in the battery module 20 as in FIG. 1 is formed by electrically connecting the different polarities of the two cylindrical batteries Ba to each other by the interconnection of the same two inter-battery connection plates 1 through the connection process described in FIG. Yes.

なお、この電池間接続構造の接続対象とする円筒形電池Ｂａは、この実施の形態において、大容量で大型のニッケル水素電池である。図４に示すように、この円筒形電池Ｂａは、負極を兼ねる有底円筒状の電池ケース７の一端開口部が、封口板１４、この封口板１４の外面に接合された電極端子板８、この電極端子板８の中央部に固着された断面Ｕ字形状のキャップ状正極端子２１、このキャップ状正極端子２１と電極端子板８との間の空間内に配置されたゴム弁体２２および絶縁ガスケット２３により構成された封口体２４により閉塞されている。封口板１４の周縁部と電池ケース７の開口端部とは、これらの間に絶縁ガスケット２３を介在した状態で電池ケース７の開口端部の内方に折り曲げるかしめ加工を施してかしめ部７ａを形成することにより、かしめ部７ａにより圧縮された絶縁ガスケット２３を介して相互に気密状態に固定されている。   In this embodiment, the cylindrical battery Ba to be connected in the inter-battery connection structure is a large-capacity and large nickel-metal hydride battery. As shown in FIG. 4, this cylindrical battery Ba has a bottomed cylindrical battery case 7 that also serves as a negative electrode, one end opening of which is a sealing plate 14, an electrode terminal plate 8 joined to the outer surface of the sealing plate 14, A cap-shaped positive terminal 21 having a U-shaped cross section fixed to the center of the electrode terminal plate 8, a rubber valve element 22 disposed in the space between the cap-shaped positive terminal 21 and the electrode terminal plate 8, and insulation. It is closed by a sealing body 24 constituted by the gasket 23. The peripheral edge portion of the sealing plate 14 and the opening end portion of the battery case 7 are bent and crimped inward of the opening end portion of the battery case 7 with the insulating gasket 23 interposed therebetween, thereby forming the caulking portion 7a. By forming, they are mutually fixed in an airtight state via the insulating gasket 23 compressed by the caulking portion 7a.

図５は、電池モジュール２０における軸方向に直列配置して隣接する２個の円筒形電池Ｂａを互いに直列接続して構成した電池間接続構造の部分を示したものである。この電池間接続構造は、図１において説明した接続過程を経て溶接部２を電池ケース７の封口板１４および底面１７にそれぞれ溶接して取り付けた同一の２枚の電池間接続板１を、同一の向きとなる配置で互いに重ね合わせて、各々の一対の連結用孔１２を合致させた相対位置に配置し、互いに重ね合わされた状態の各２つの連結用孔１２の一方側から挿通したボルト１９を他方側のナット１３に螺合締結することにより、上記２枚の電池間接続板１が相互に電気的接続状態で連結される。この連結時においても、図４の電池間接続構造の場合と同様に、双方の電池間電極板１の歪みを各々のスリット１１の存在により容易に変形させて吸収できるから、ボルト１９とナット１３の確実な締結を行うことができる。   FIG. 5 shows a part of an inter-battery connection structure in which two cylindrical batteries Ba arranged in series in the axial direction in the battery module 20 are connected in series to each other. In this inter-battery connection structure, the same two inter-battery connection plates 1 that are attached by welding the welded portion 2 to the sealing plate 14 and the bottom surface 17 of the battery case 7 through the connection process described in FIG. The bolts 19 are overlapped with each other in the orientation of the two, and are arranged at relative positions where the pair of connecting holes 12 are aligned with each other, and are inserted from one side of the two connecting holes 12 in a state of being overlapped with each other. Are screwed and fastened to the nut 13 on the other side, whereby the two inter-battery connection plates 1 are connected to each other in an electrically connected state. Also at the time of this connection, as in the case of the inter-battery connection structure of FIG. 4, the distortion of both inter-battery electrode plates 1 can be easily deformed and absorbed by the presence of the respective slits 11. Can be securely fastened.

図４および図５にそれぞれ示した電池間接続構造は、以下に示すような顕著な効果を奏する。すなわち、この電池間接続構造では、隣接する２つの円筒形電池Ｂａを相互に接続する電池間接続板１が、電池ケースＢａの円形端面に含有される半円弧形状の溶接部２を、電池ケースＢａにおける平坦面となった底面１７からなる負極電極端子および電極端子板８からキャップ状正極端子２１が突出した正極電極端子の何れにも溶接により固着することができ、この固着状態の電池間接続板１の接続部３が円筒形電池Ｂａの側方に突出する。   The inter-battery connection structure shown in FIGS. 4 and 5 has the following remarkable effects. That is, in this inter-battery connection structure, the inter-battery connection plate 1 that connects two adjacent cylindrical batteries Ba to each other is connected to the semicircular arc-shaped weld 2 contained in the circular end surface of the battery case Ba. Both the negative electrode terminal consisting of the bottom surface 17 which is a flat surface in Ba and the positive electrode terminal where the cap-like positive electrode terminal 21 protrudes from the electrode terminal plate 8 can be fixed by welding, and the inter-battery connection in this fixed state The connecting portion 3 of the plate 1 protrudes to the side of the cylindrical battery Ba.

したがって、図５に示すように、隣接する２個の円筒形電池Ｂａに固着した２枚の電池間接続板１の各接続部３を同一の向きとなる配置で重ね合わせて連結することにより、２個の円筒形電池Ｂａを電池軸方向に配列して直列接続することが可能である。一方、図４に示すように、２枚の電池間接続板１を互いに反対方向を向く配置で各々の接続部３を重合して連結することにより、径方向に並置した配置の２個の円筒形電池Ｂａを直列接続することが可能となる。このように、複数個の円筒形電池Ｂａを電池軸方向に直列配置および径方向に並置した配置の何れに対しても、同一の電池間接続板１によって隣接する各２個を互いに接続できることから、部品費用および製造コストを共に低減できるので、電池モジュール２０またはこの電池モジュール２０を使用個数連結する電池パックを極めて安価に製作することができる。   Therefore, as shown in FIG. 5, by connecting the connection portions 3 of the two inter-battery connection plates 1 fixed to the two adjacent cylindrical batteries Ba in an arrangement in the same direction, Two cylindrical batteries Ba can be arranged in series in the battery axial direction and connected in series. On the other hand, as shown in FIG. 4, two cylinders arranged side by side in the radial direction by overlapping and connecting the connecting portions 3 in the arrangement in which the two inter-battery connection plates 1 face each other in the opposite direction. The battery cells Ba can be connected in series. In this way, two adjacent batteries can be connected to each other by the same inter-battery connection plate 1 for both the series arrangement in the battery axial direction and the arrangement in which the plurality of cylindrical batteries Ba are juxtaposed in the radial direction. Since both the part cost and the manufacturing cost can be reduced, the battery module 20 or the battery pack connecting the used number of battery modules 20 can be manufactured at a very low cost.

また、電池間接続板１は、単なる板状であるとともに、その接続部３が円筒形電池Ｂａの側方に突出する状態で取り付けられるから、互いに接続された２個の円筒形電池Ｂａの間に通風可能な隙間が確保されて、十分な放熱効果を得ることができる。しかも、接続部３は円筒形電池Ｂａの側方において互いに連結するので、溶接以外のボルト１９とナット１３の締結手段や、図示していないリベットのかしめ手段などを採用することができる。そのため、大型円筒形電池を接続する場合であっても、溶接工程の削減によって容易に接続でき、構成の簡素化によって接続部分の重量が増大することがなく、半円弧状の溶接部２と電池ケース７との接合面積が大きいことから、衝撃を受けたときの強度を十分に確保できる高い堅牢性を得ることができる。   Further, the inter-battery connection plate 1 has a simple plate shape and is attached in a state in which the connection portion 3 protrudes to the side of the cylindrical battery Ba, so that the connection between the two cylindrical batteries Ba connected to each other. A gap that allows ventilation is secured, and a sufficient heat dissipation effect can be obtained. Moreover, since the connecting portions 3 are connected to each other on the side of the cylindrical battery Ba, it is possible to employ fastening means for the bolts 19 and nuts 13 other than welding, caulking means for rivets (not shown), and the like. Therefore, even when a large cylindrical battery is connected, it can be easily connected by reducing the welding process, and the weight of the connection portion does not increase due to the simplification of the configuration. Since the joint area with the case 7 is large, it is possible to obtain high robustness that can sufficiently ensure strength when subjected to an impact.

さらに、電池間接続板１の溶接部２を封口板１４に溶接するに際しては、溶接部２が電池ケース７のかしめ部７ａと封口板１４の外面とが形作る凹所に嵌まり込み、且つ段差部４の外側面が絶縁リング１８の内側周面１８ａに嵌合状態に当接して位置決めされた安定な保持状態で溶接できるので、溶接部２を封口板１４の外面に確実に溶接することができ、常にばらつくことなく高い溶接強度が得られて、堅牢性の高い接合状態となる。また、電池間接続板１が円筒形電池の正極電極端子側に固着されたときには、図４および図５に明示するように、電池ケース７のかしめ部７ａの軸方向の端部と接続部３との間に隙間が確保されるので、放熱性が向上する利点があり、電池間接続板１は、絶縁リング１８の存在により、電池ケース７と封口板１４とを電気的に短絡するおそれがない。   Further, when welding the welded portion 2 of the inter-battery connection plate 1 to the sealing plate 14, the welded portion 2 fits into a recess formed by the caulking portion 7 a of the battery case 7 and the outer surface of the sealing plate 14, and Since the outer surface of the portion 4 can be welded in a stable holding state in which the outer surface of the portion 4 is in contact with the inner peripheral surface 18a of the insulating ring 18 and positioned, it is possible to reliably weld the welded portion 2 to the outer surface of the sealing plate 14. It is possible to obtain a high welding strength without always varying, and to achieve a joined state with high robustness. Further, when the inter-battery connection plate 1 is fixed to the positive electrode terminal side of the cylindrical battery, as clearly shown in FIGS. 4 and 5, the end portion in the axial direction of the caulking portion 7 a of the battery case 7 and the connection portion 3. Since there is a gap between the battery case 7 and the battery connection plate 1, there is a possibility that the battery case 7 and the sealing plate 14 are electrically short-circuited due to the presence of the insulating ring 18. Absent.

また、図２で説明したように、電池間接続板１の接続部３は、溶接部２の半円弧状の径よりも大きく、且つ電池ケース７の直径未満の間隔で溶接部２から互いに平行に延出する２つの側辺３ａ，３ｂと、この両側辺３ａ，３ｂに直交する端辺３ｃとで囲まれたほぼ矩形状に形成されていることから、この接続部３が、円筒形電池Ｂａに対して、自体の長手方向にのみ突出するだけであって、幅方向に出っ張らない。これにより、２つの接続部３を互いに連結する箇所が電池ケース７の直径の範囲内に設定することができ、後述するように、多数個の円筒形電池Ｂａを、容易、且つ安定した配置で複数段に積み重ねて、電池モジュール２０または電池パックを容易に構成することができる。   In addition, as described with reference to FIG. 2, the connection portion 3 of the inter-battery connection plate 1 is larger than the semicircular arc diameter of the weld portion 2 and parallel to each other from the weld portion 2 at intervals less than the diameter of the battery case 7. Is formed in a substantially rectangular shape surrounded by two side edges 3a and 3b extending to the side edges and an end edge 3c orthogonal to the both side edges 3a and 3b. It protrudes only in the longitudinal direction of Ba, and does not protrude in the width direction. Thereby, the location where the two connecting portions 3 are connected to each other can be set within the range of the diameter of the battery case 7, and as will be described later, a large number of cylindrical batteries Ba can be easily and stably arranged. The battery module 20 or the battery pack can be easily configured by stacking in a plurality of stages.

さらにまた、電池間接続板１は、鉄、銅、黄銅等の少なくとも片面にニッケルを表面加工した素材、或いはニッケル、鉄、銅、黄銅等を素材として形成されているので、電気抵抗が小さいものとなる。一方、電池間接続板１を相互に連結するボルト１９とナット１３としては、黄銅製のものを用いるのが好ましい。この黄銅製のボルト１９とナット１３を用いる場合には、銅製の電池間接続板１と組み合わせることにより、双方のなじみが最適となって電池抵抗を極めて低くできるから、これを用いて構成した電池モジュール２０または電池パックの高出力化を一層促進できる。   Furthermore, the inter-battery connection plate 1 is made of a material such as iron, copper, brass, etc., which is nickel-finished on at least one surface, or nickel, iron, copper, brass, etc. It becomes. On the other hand, as the bolts 19 and the nuts 13 that connect the inter-battery connection plates 1 to each other, it is preferable to use those made of brass. In the case of using the brass bolt 19 and the nut 13, the combination of the copper inter-battery connection plate 1 optimizes the familiarity of both, and the battery resistance can be extremely reduced. Higher output of the module 20 or the battery pack can be further promoted.

また、上記実施の形態では、ボルト１９とナット１３との螺合締結により２個の円筒形電池Ｂａを相互に接続したのちの電池間接続板１が、遠赤塗料の塗着により被覆されており、これにより、電池間接続板１が電気的に絶縁されて安全性が高められるとともに、電池間接続板１に放熱効果が付加され、あたかも放熱フィンの如く機能する。   Further, in the above embodiment, the inter-battery connection plate 1 after the two cylindrical batteries Ba are connected to each other by screwing the bolts 19 and the nuts 13 is covered with the application of the far-red paint. As a result, the inter-battery connection plate 1 is electrically insulated to enhance safety, and a heat dissipation effect is added to the inter-battery connection plate 1 so that it functions as if it were a radiating fin.

図７は実施の形態の電池間接続構造を用いて構成した電池パック２７を示したものであり、この電池パック２７は、図３とほぼ同等の構成とした電池モジュール２０を２つ用いて、これら２つの電池モジュール２０を互いに相対向する配置で２段重ねに積み重ねた状態で各円筒形電池Ｂａを直列接続して構成したものである。この電池パック２７は、軸方向に直列配置で隣接する２個の円筒形電池Ｂａの直列接続および径方向に並置状態の配置で隣接する２個の円筒形電池Ｂａの直列接続の双方に用いることができる電池間接続板１を用いて構成でき、１種類の電池間接続板１によって全ての円筒形電池Ｂａの接続を行えることから、大幅なコストダウンを達成することができる。   FIG. 7 shows a battery pack 27 configured by using the inter-battery connection structure of the embodiment. This battery pack 27 uses two battery modules 20 having a configuration substantially the same as FIG. These two battery modules 20 are configured in such a manner that the cylindrical batteries Ba are connected in series in a state where the two battery modules 20 are stacked so as to face each other. This battery pack 27 is used for both serial connection of two cylindrical batteries Ba adjacent in series in the axial direction and serial connection of two cylindrical batteries Ba adjacent in radial arrangement. The battery connecting plate 1 can be configured, and all the cylindrical batteries Ba can be connected by one type of battery connecting plate 1, so that significant cost reduction can be achieved.

図３の電池モジュール２０の構成に際しては、円筒形電池Ｂａの両端にそれぞれ固着される各一対の電池間接続板１が、各々の接続部３の突出方向のなす角度が９０°となる相対配置に設定して円筒形電池Ｂａに固着されている。一方、図７の電池パック２７の構成に際しては、円筒形電池Ｂａの両端にそれぞれ固着される各一対の電池間接続板１が、図３と同様に、各々の接続部３の突出方向のなす角度が９０°となる相対配置に設定して円筒形電池Ｂａに固着されているのに加えて、接続部３の突出方向のなす角度が１８０°となる相対配置に設定して円筒形電池Ｂａに固着されている。   In the configuration of the battery module 20 in FIG. 3, the pair of inter-battery connection plates 1 fixed to both ends of the cylindrical battery Ba are relatively arranged so that the angle formed by the protruding direction of each connection part 3 is 90 °. Is fixed to the cylindrical battery Ba. On the other hand, in the configuration of the battery pack 27 in FIG. 7, each pair of inter-battery connection plates 1 fixed to both ends of the cylindrical battery Ba is formed in the protruding direction of each connection portion 3 as in FIG. 3. In addition to being fixed to the cylindrical battery Ba by setting the relative position so that the angle is 90 °, the cylindrical battery Ba is set so that the angle formed by the protruding direction of the connecting portion 3 is 180 °. It is fixed to.

さらに、図６は実施の形態の電池間接続構造を用いて構成した他の電池パック２８の一部を示したものである。この電池パック２８は、図７のものと同様に、図３とほぼ同等の構成とした電池モジュール２０を２つ用いて、これら２つの電池モジュール２０を２段重ねに積み重ねた状態で各円筒形電池Ｂａを直列接続して構成したものであるが、上下の電池モジュール２０の位置をずらせて各円とうかた電池Ｂａを俵積み配置に積み重ねた構成になっている。この電池パック２８では、下方の電池モジュール２０における右端の円筒形電池Ｂａの両端に固着される一対の電池間接続板１が、各々の接続部３の突出方向のなす角度が６０°となる相対配置に設定して円筒形電池Ｂａに固着されており、上方の電池モジュール２０における右端の円筒形電池Ｂａの両端に固着される一対の電池間接続板１が、各々の接続部３の突出方向のなす角度が１２０°となる相対配置に設定して円筒形電池Ｂａに固着されている。   Further, FIG. 6 shows a part of another battery pack 28 configured by using the inter-battery connection structure of the embodiment. This battery pack 28 uses two battery modules 20 having substantially the same structure as that shown in FIG. 3 as in FIG. 7, and each of the two battery modules 20 is stacked in a two-tiered state. The batteries Ba are connected in series, but the upper and lower battery modules 20 are shifted so that the batteries Ba are stacked in a stacking arrangement. In this battery pack 28, the pair of inter-battery connection plates 1 fixed to both ends of the rightmost cylindrical battery Ba in the lower battery module 20 has a relative angle of 60 ° between the protruding directions of the respective connection portions 3. The pair of inter-battery connection plates 1 fixed to the cylindrical battery Ba in the arrangement and fixed to both ends of the rightmost cylindrical battery Ba in the upper battery module 20 are projected in the protruding directions of the respective connection portions 3. Is fixed to the cylindrical battery Ba with a relative arrangement in which the angle between the two is 120 °.

すなわち、上記実施の形態の電池間接続構造では、同一形状の１種類の電池間接続板１のみを用いるだけであるにも拘らず、各円筒形電池Ｂａの両電極端子にそれぞれ接続される一対の電池間接続板１を、各々の接続部３の円筒形電池Ｂａからの突出方向がなす角度を任意の角度の相対配置に設定することにより、電池モジュールの製作に際して、円筒形電池Ｂａを俵積み配置や千鳥配置などの種々の配列形態に配列する構成に容易に対応することができる大きな利点がある。   That is, in the inter-battery connection structure of the above embodiment, a pair connected to both electrode terminals of each cylindrical battery Ba, although only one type of inter-battery connection plate 1 having the same shape is used. When the battery module is manufactured, the inter-battery connection plate 1 is set to have an arbitrary angle relative to the projecting direction of each connection part 3 from the cylindrical battery Ba. There is a great advantage that it is possible to easily cope with configurations arranged in various arrangement forms such as stacked arrangement and staggered arrangement.

この発明の電池間接続構造は、同一の電池間接続板により、２個の円筒形電池を軸方向に配列して配置で直列接続する用途と、２個の円筒形電池を径方向に並置した配置で直列接続する用途との双方に用いることができることから、部品費用および製造コストを共に低減できるので、電池モジュールまたは電池パックを安価に製作することがができるともに、互いに接続された２個の円筒形電池の間に通風可能な隙間が確保されて、十分な放熱効果を得ることができ、さらに、２枚の電池間接続板を溶接以外のボルトとナットの締結手段などで相互に連接できるため、大型円筒形電池を接続する場合であっても、溶接工程の削減によって容易に接続でき、構成の簡素化に伴って接続部分の重量が増大することがなく、半円弧状の溶接部と電池ケースとの接合面積が大きいことに起因して衝撃を受けたときの強度を十分に確保できる高い堅牢性を得ることができる。   The inter-battery connection structure according to the present invention uses the same inter-battery connection plate to arrange two cylindrical batteries in an axial direction and connect them in series in an arrangement, and two cylindrical batteries juxtaposed in the radial direction. Since it can be used for both applications that are connected in series by arrangement, both the component cost and the manufacturing cost can be reduced, so that the battery module or the battery pack can be manufactured at a low cost, and the two connected to each other can be manufactured. A space that allows ventilation between the cylindrical batteries is ensured, and a sufficient heat dissipation effect can be obtained. Further, the two battery connection plates can be connected to each other by fastening means such as bolts and nuts other than welding. Therefore, even when connecting a large cylindrical battery, it can be easily connected by reducing the welding process, and the weight of the connection portion does not increase with the simplification of the configuration, battery Strength can be obtained a high robustness can be sufficiently ensured when subjected to impact due to a large bonding area between the over scan.

本発明の一実施の形態に係る電池間接続構造の接続構成を示す斜視図。The perspective view which shows the connection structure of the connection structure between batteries which concerns on one embodiment of this invention. 同上の接続構造に用いる電池間接続板を示す斜視図。The perspective view which shows the connection board between batteries used for the connection structure same as the above. 同上の電池間接続構造を用いて構成した電池モジュールを示す斜視図。The perspective view which shows the battery module comprised using the battery connection structure same as the above. 図３のＡ−Ａ線切断拡大断面図。FIG. 4 is an enlarged sectional view taken along line AA in FIG. 3. 図３のＢ−Ｂ線切断拡大断面図。FIG. 4 is an enlarged sectional view taken along line BB in FIG. 3. 同上の電池間接続構造を用いて構成した電池パックを示す側面図。The side view which shows the battery pack comprised using the connection structure between batteries same as the above. 同上の電池間接続構造を用いて構成した他の電池パックを示す一部の側面図。The partial side view which shows the other battery pack comprised using the connection structure between batteries same as the above. 従来の電池間接続構造を示す縦断面図。The longitudinal cross-sectional view which shows the conventional connection structure between batteries. 従来の他の電池間接続構造を示す縦断面図。The longitudinal cross-sectional view which shows the other conventional connection structure between batteries.

符号の説明Explanation of symbols

１ 電池間接続板
２ 溶接部
３ 接続部
３ａ，３ｂ 側辺
３ｃ 端辺
４ 段差部
７ 電池ケース
７ａ かしめ部
９ プロジェクション
１０ 溶接部のスリット
１１ 接続部のスリット
１２ 連結用孔
１４ 封口板
１７ 底面
１８ 絶縁リング
２４ 封口体
Ｂａ 円筒形電池 1 Battery connection plate
2 Welded part
3 connection part 3a, 3b side 3c end
4 steps
7 Battery case 7a Caulking part
DESCRIPTION OF SYMBOLS 9 Projection 10 Slit of welding part 11 Slit of connection part 12 Connection hole 14 Sealing plate 17 Bottom face 18 Insulating ring 24 Sealing body Ba Cylindrical battery

Claims (15)

有底円筒状の電池ケースの底面を一方の電極端子とし、且つ前記電池ケースの開口端側に設けた封口体を他方の電極端子とした円筒形電池を複数個備え、これら円筒形電池を軸方向に直列配置または径方向に並置して、隣接する各２個の円筒形電池の異極電極端子を互いに電気的、且つ機械的に接続する電池間接続構造において、
前記電池ケースの円形端面内に包含される形状の溶接部とこの溶接部から延出する接続部とを一体に有する電池間接続板を備え、
前記電池ケースの一方の電極端子および他方の電極端子にそれぞれ、前記溶接部を溶接して前記電池間接続板が固着され、
隣接する各２個の円筒形電池にそれぞれ固着された前記電池間接続板の各々の前記接続部が互いに重ね合わせられて電気的接続状態に連結されていることを特徴とする電池間接続構造。 A plurality of cylindrical batteries having a bottom surface of a cylindrical battery case having a bottom as one electrode terminal and a sealing body provided on the opening end side of the battery case as the other electrode terminal are provided. In the inter-battery connection structure in which the opposite electrode terminals of each two adjacent cylindrical batteries are electrically and mechanically connected to each other in series arrangement in the direction or juxtaposed in the radial direction,
An inter-battery connection plate integrally including a welded portion included in the circular end surface of the battery case and a connecting portion extending from the welded portion;
The inter-battery connection plate is fixed by welding the welded portion to one electrode terminal and the other electrode terminal of the battery case,
An inter-battery connection structure, wherein the connection parts of the inter-battery connection plates fixed to two adjacent cylindrical batteries are overlapped and connected to each other in an electrically connected state. 電池間接続板が、溶接部と接続部との境界に沿って段差部が設けられ、前記溶接部が半円弧状であって、かつ前記接続部に対し凹状に形成されている請求項１に記載の電池間接続構造。 Inter-battery connection plate is, the step portion is provided along a boundary between the connecting portion welds, the weld is a semi-circular, and the connecting portion according to claim 1, which is formed in a concave shape with respect to The inter-battery connection structure described in 1. 電池ケースにおける開口端側のかしめ部が絶縁リングで被覆され、電池間接続板における段差部が、これの接続部側の外側面が前記絶縁リングの内側周面にほぼ合致する曲率半径を有する半円弧状を有し、且つ前記かしめ部の軸方向の端部と封口板の外面との段差よりも大きな高さを有する形状に形成されている請求項２に記載の電池間接続構造。   The caulked portion on the open end side of the battery case is covered with an insulating ring, and the stepped portion of the inter-battery connecting plate has a radius of curvature in which the outer surface on the connecting portion side substantially matches the inner peripheral surface of the insulating ring. 3. The inter-battery connection structure according to claim 2, wherein the inter-battery connection structure is formed in a shape having an arc shape and having a height greater than a step between an axial end of the caulking portion and an outer surface of the sealing plate. 電池ケースの一方および他方の電極端子の何れにも同一形状の電池間接続板が固着されている請求項１ないし３の何れかに記載の電池間接続構造。   The inter-battery connection structure according to any one of claims 1 to 3, wherein an inter-battery connection plate having the same shape is fixed to both the one and the other electrode terminals of the battery case. 各円筒形電池の両電極端子にそれぞれ接続される一対の電池間接続板が、各々の接続部の前記円筒形電池からの突出方向がなす角度を任意に設定した相対配置で接続されている請求項１ないし４の何れかに記載の電池間接続構造。 A pair of inter-battery connection plates respectively connected to both electrode terminals of each cylindrical battery are connected in a relative arrangement in which the angle formed by the projecting direction of each connecting part from the cylindrical battery is arbitrarily set. Item 5. The inter-battery connection structure according to any one of Items 1 to 4 . 電池間接続板の接続部が、溶接部の半円弧状の径よりも大きく、且つ電池ケースの直径未満の間隔で前記溶接部から互いに平行に延出する２つの側辺と、この両側辺に直交する端辺とで囲まれた形状に形成されている請求項２または３に記載の電池間接続構造。 The connecting portion of the inter-battery connecting plate is larger than the semicircular arc-shaped diameter of the welded portion and extends in parallel to each other from the welded portion at an interval less than the diameter of the battery case, 4. The inter-battery connection structure according to claim 2, wherein the inter-battery connection structure is formed in a shape surrounded by orthogonal end sides. 電池間接続板の接続部における端辺の近傍の両端側箇所に一対の連結用孔が形成されている請求項６に記載の電池間接続構造。   The inter-battery connection structure according to claim 6, wherein a pair of connection holes are formed at both ends near the end side of the connection part of the inter-battery connection plate. 隣接する２枚の電池間接続板が、各々の接続部がこれらの連結用孔を合致させた相対位置で互いに重ね合わされて、前記合致した連結用孔を介してボルトとナットとを螺合締結することにより電気的に接続されている請求項７に記載の電池間接続構造。   Two adjacent inter-battery connection plates are overlapped with each other at relative positions where the connecting portions match the connecting holes, and the bolts and nuts are screwed and fastened through the matching connecting holes. The inter-battery connection structure according to claim 7, wherein the connection is made electrically. 隣接する２枚の電池間接続板における互いに重ね合わされる接続部のうちの一方に、連結用孔に合致した配置でナットが溶接により予め固着されている請求項８に記載の電池間接続構造。   9. The inter-battery connection structure according to claim 8, wherein a nut is fixed in advance by welding to one of the connection portions of the two adjacent inter-battery connection plates that are overlapped with each other so as to match the connecting hole. ボルトとナットが黄銅製である請求項８または９に記載の電池間接続構造。   The inter-battery connection structure according to claim 8 or 9, wherein the bolt and the nut are made of brass. 電池間接続板の接続部における一対の連結用孔の間の箇所にスリットが形成されている請求項７ないし１０の何れかに記載の電池間接続構造。   The inter-battery connection structure according to any one of claims 7 to 10, wherein a slit is formed at a position between the pair of connecting holes in the connection part of the inter-battery connection plate. 電池間接続板の溶接部に、円筒形電池の電極端子に対する溶接用のプロジェクションが複数設けられ、且つ隣接する２個の前記プロジェクションの間にスリットが形成されている請求項１ないし１１の何れかに記載の電池間接続構造。   The welding portion of the inter-battery connection plate is provided with a plurality of projections for welding to the electrode terminals of the cylindrical battery, and a slit is formed between two adjacent projections. The inter-battery connection structure described in 1. 電池間接続板は、鉄、銅、黄銅のいずれかの少なくとも片面にニッケルを表面加工した素材、或いはニッケル、鉄、銅、黄銅のいずれかを素材として形成されている請求項１ないし１２の何れかに記載の電池間接続構造。   The inter-battery connection plate is formed by using at least one surface of nickel, iron, copper, or brass as a raw material, or by using nickel, iron, copper, or brass as a raw material. Connection structure between batteries. 隣接する２枚の電池間接続板が、互いに連結されたのちに絶縁塗料で被覆されている請求項１ないし１３の何れかに記載の電池間接続構造。   The inter-battery connection structure according to any one of claims 1 to 13, wherein two adjacent inter-battery connection plates are covered with an insulating paint after being connected to each other. 絶縁塗料として遠赤塗料が用いられている請求項１４に記載の電池間接続構造。   The inter-battery connection structure according to claim 14, wherein a far-red paint is used as the insulating paint.
JP2005116373A 2005-04-14 2005-04-14 Connection structure between batteries Expired - Fee Related JP5005183B2 (en)

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